Symptom: boot after the power supply relay keeps flashing between the pass and breaking off, after a few minutes intervals gradually lengthen until the suction power on, boot to work properly. But sometimes it just won't boot, this phenomenon is rare in the Denon amplifier repair.CwGservice manual download site
CwGservice manual download site
Inspection and maintenance procedures: AVR-1404 amplifier repair response when sending users to other repair shop repaired, that is to change the chip was not part. Teardown observed many screws are not installed correctly, circuit board there is no apparent damage. Denon AV amplifiers do not normally burn chips, amplifier repairs, as long as the regular brand machines have very few bad chips. So this case should proceed from the power on the power supply fault checking, measuring standby voltage is normal, the AC power switch is a tube of standby transformer power supply,CwGservice manual download site
CwGservice manual download site
Did not like the Onkyo amp standby key, after the start signal when the standby transformer by remote control, shut down before the memory status, that is, when the last shutdown was the first to use the remote control to turn off, then the next boot after must use the remote control to open, so that remote control is important, if you lose might not be able to boot. And analog signal to digital signal selection is in operation on the remote control.CwGservice manual download site
Around the power on relay around the circuit soon detected diode D150/D153/D154 has penetratedCwGservice manual download site
CwGservice manual download site
And after replacing test machine, boot normally. Installed Hou test Shi is found sometimes main following electrical still will Flash broken, away motivation body other following electrical also can Shi not Shi of heard pass broken of sound, through repeatedly shake, found seems to has contact bad of phenomenon, split Xia motherboard Hou see has is long no found virtual welding of place, after repeatedly observation, finally found a at circuit board minor fracture, the circuit just is standby power of cathode, obviously is last maintenance Shi not carefully caused of, received good Hou repeatedly try machine no appeared fault.

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